I have used Claude Code daily for more than 6 months, mainly for coding and development work, and also a lot for writing research papers. The underlying Claude models are, in my opinion, some of the best out there, which is why the agent performs so well on both fronts. The one area where it clearly struggles is data science work, where it is noticeably weaker than it is at general coding or writing. On the models, I split tasks based on what they need: Fable handles planning and review, Opus is my primary model for heavy work, and Sonnet takes on lighter tasks that don't need much reasoning. The biggest downside is the subscription. Pro's limits were not enough for daily use, so I moved to Max, but that plan is expensive for a solo developer, and the usage caps have gotten stingier over time without the price changing to match. Despite that, it is still the agent I reach for every day.